Traveler for ring spinning and ring doubling frames



April 1935- c. F. HOFMANN 1,997,521

TRAVELER FOR RING SPINNING AND RING DOUBLING FRAMES I Filed Dep. so,1932 Urzverzzor: C. F? ofman/z Patented Apr. 9, 193

UNITED STATES TRAVELER, Fort 1,997,521 g p 1 KING SPINNINGANDYBINGDOUBLING FRAMES Carl Fritz, Hofmann,

Schonau, near Chemnltz, Germany "Application December so, 1932, SerialNo. 649,649

In Gerrnany September 1, 1932 I 1 Claim. (01. -i1a-s1) The inventionrelates to a traveler for ring spinning and ring doubling frames.

In travelers of this kind there are substantially two differentconstructional forms, firstly the earshaped traveler andsecondlytheC-shaped traveler. The former runs on a ring, the main walls of which,at the same time formingbearing surfaces for the traveler, extendperpendicular to the ring rail, while in the second constructional formthe bearing and running surfaces for the travelerare on a so-called ring-head and'extend parallel to the ring rail. i 1 p The traveler accordingto the inventionintended more particularly for ring spinning and ringdoubling frames belongs to the latter constructional form and isintended for use with the socalled T-shapedtraveler rings.

Such travelers bear during therspinningor doubling operation only with asingle place in the interior of the ring at the lower side of thehead,the place of contact changingundertthe action of centrifugal force andof the pull of the thread, while the traveler itself by changing theposition of its centre of gravity changes its position with respect tothe upperside of the ring head.

During the, swinging motion of the traveler about its variable pointofcontact at the inside edge of the ring, which thus occurs, it ispossible more particularly when the pull of the threadeases, for the endpart of the traveler embracing the outer edge of the ring head to bearwithits end edge against the ring neck, the result of which may be todisturb the steady, even running of the traveler with detriment to thespinningor doubling operation.

In order to obviate this disadvantage, according to the invention thetraveler is givenin the middle'part connecting its end parts adepression or.

similarly shaped form, bymeans of which it can rest on the upper side ofthe ring head, as close as possible to the outer rim of the outer edgeof the latter, so that the external traveler end more particularly willin no case bearagainst the outer surface of the neck of the ring.

Such a traveler constructed according to, the invention has akidney-shaped contour and slides with its middle part from time to time,more particularly when the thread tension relaxes, on the surface of thering head, having a slight braking effect without however catching,which will tend to bring about an equalization of the forces occurringduring the movement of the traveler and favourably to influence theso-called traveler,

play. a

In a suitable constructional form the distance between the depressionand the connecting line of the two and parts is relatively. great.

This suitableform of the ring traveler according to the invention, ofwhich the sides or end parts, the form of which is arcuate or is based 5on the arcs of circles, are connected by an arouate andinwardly recessedmiddle part, provides an increased traveler play with an improved guideing of thetraveler, while the runningof the trav-' effective.

3 Care should be taken that the curvatures of the arcuate end parts ofthe traveler are relatively,

eler wilibe easier but more reliable and more Y great, being forinstance made sogreat with re- ,chief determining factors for the.traveler play.

When the thread tension relaxes considerably, the middle part whichconnects the two arcuate end parts of the traveler will rest on theupper surface of the ring head and cause a braking effeet which willoccur at the right moment and increase the thread tension andconsequently a relifting oi the ring traveler and its return into itsfloating or suspended position.

The bearing of the traveler with its middle part on the upper surface ofthe ring head which occurs when the thread tension is smallest has thefurther advantage that owing to the side or end partsiof thering beingarcuate or following the arcs of circles, which parts owing to theirsuitable shape enable the thread to play easily and do not allow of anyjamming or canting, there is an additional favourable guiding of thering. which guiding acts in opposition to any tendencies ofithe travelerto cant, while a slight additional braking action is produced, which hasafavourableeii'ect on the running of the traveler, just at the momentwhen this is required for bringing the traveler into its best workingposition, namely the suspended position.

In the accompanying drawing, Figure 1 shows an elevation of a traveler,embodying the invention, normally positioned on airing-head underordinary working conditions, the rlnghead being shown in section. Fig. 2is a similar viewpshowing the traveler tilted on the ring-head, due to alessening of the thread tension.

Referring to the drawing in detail, the traveler ring comprises theflanged head b and the web e of usual construction. On the ring ismounted the kidney-shaped traveler a, comprising arcuate side parts h,with each of said side parts extending through a segment ofapproximately one-half of a circle. The upper endsv of the arcuate sidesare curved to merge into the shallow intermediate projection f, and thelower ends or horns d and d of the arcuate sides are curved inwardlywith their extremities spaced apart opposite to each other and oppositeto the intermediate projection f. Each of the arcuate side parts has avertical extension considerably in excess of its horizontal extensionbetween its outer curved side and a line coincident with the apex of theintermediate projection f and normal to a line connecting theextremities of the horns d and df of the traveler element. The excess inthe vertical extension of each arcuate side part provides the verticallyelongated curved sides h of the traveler.

During a normal spinning or doubling operation the traveler a rides onthe ring-head b with the inner arcuate side it in engagement with theinner flange part c of the ring-head b. As the traveler rides around thering-head, the point of contact of the traveler with the ringhead, as atC, shifts slightly and there is a slight oscillation of the traveleraround the flanged headb of the ring, due to the variation of the threadtension, Should the thread tension be lessened sumciently, the travelerwould tilt to the left as shown in Fig. 2, causing the intermediateprojection to ride on the outer flange of the head 12, as at D. Thissliding engagement of the projection ,f with'the outer flange limits thetilting of the traveler, thereby preventing contact of the outer end orhorn d of the traveler with the web e of the ring. During the movementof the traveler, should the outer end d of the traveler bear against theweb e, the resulting friction would tend to cant the traveler and alsocause a lag in the travel of the element.

The canting of the traveler and excessive lag in its travel wouldinterfere with the proper operationof the traveling element. Thefrictional contact of the intermediate projection f with the outerflange of ring-head would effect a slight braking of the running of thetraveler, thereby increasing the tension'of the engaged thread. Thisincrease of the thread tension would lift the traveler to clear theintermediate projection I from the ring-head, and the traveler would bereturned to its normal suspended position as shown in Fig. 1.

It will be obvious that the traveler according to the invention can thusslide relatively easily on the upper side of the ring head, but thatnevertheless an increased beneficial braking effect is exerted on it,with the result already described.

The advantages of spinning and doubling when using the traveleraccording to the invention are, besides the improved running of thetraveler already referred to and the more favourable play of the threadand traveler, a noticeable falling oil in traveler and thread breakages,more solid winding and the production of a better yarn of greaterstrength with less inequalities and consequently a considerablyincreased production.

Furthermore the rings are subjected to less wear and tear and theadvantage of the traveler according to the invention is immediatelyapplicable withoutany cost for adapting the machines and withoutinterfering with the normal operation, so that the costs can be greatlyreduced.

-What I claim is:

A. ring traveler comprising a kidney-shaped element including arcuateside parts curved into a shallow inwardly projecting intermediate part,with the end parts of the element curved toward each other and theirextremities spaced apart opposite to the intermediate part, each of saidarcuate side parts being approximately a segment of a circle andextending through about one-half the circumference of the circle, andeach of said arcuate side parts having a vertical ex tensionconsiderably in excess of its horizontal extension between the outercurved side' of the side part and a line coincident with the apex of theintermediate projecting part and normal to a line connecting theextremities of the traveler element, said excess in the verticalextension of each arcuate side part providing vertically elongatedcurved sides to the traveler.

CARL FRITZ HOFMANN.

